text: /**
   * OMAP1 Dual-Mode Timers - platform device registration
   *
   * Contains first level initialization routines which internally
   * generates timer device information and registers with linux
   * device model. It also has low level function to chnage the timer
   * input clock source.
   *
   * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   * Tarun Kanti DebBarma <tarun.kanti@ti.com>
   * Thara Gopinath <thara@ti.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   * kind, whether express or implied; without even the implied warranty
   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  
  #include <linux/clk.h>
  #include <linux/io.h>
  #include <linux/err.h>
  #include <linux/slab.h>
  #include <linux/platform_device.h>
  
  #include <mach/irqs.h>
  
  #include <plat/dmtimer.h>
  
  #define OMAP1610_GPTIMER1_BASE		0xfffb1400
  #define OMAP1610_GPTIMER2_BASE		0xfffb1c00
  #define OMAP1610_GPTIMER3_BASE		0xfffb2400
  #define OMAP1610_GPTIMER4_BASE		0xfffb2c00
  #define OMAP1610_GPTIMER5_BASE		0xfffb3400
  #define OMAP1610_GPTIMER6_BASE		0xfffb3c00
  #define OMAP1610_GPTIMER7_BASE		0xfffb7400
  #define OMAP1610_GPTIMER8_BASE		0xfffbd400
  
  #define OMAP1_DM_TIMER_COUNT		8
  
  static int omap1_dm_timer_set_src(struct platform_device *pdev,
  				int source)
  {
  	int n = (pdev->id - 1) << 1;
  	u32 l;
  
  	l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
  	l |= source << n;
  	omap_writel(l, MOD_CONF_CTRL_1);
  
  	return 0;
  }
  
  static int __init omap1_dm_timer_init(void)
  {
  	int i;
  	int ret;
  	struct dmtimer_platform_data *pdata;
  	struct platform_device *pdev;
  
  	if (!cpu_is_omap16xx())
  		return 0;
  
  	for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
  		struct resource res[2];
  		u32 base, irq;
  
  		switch (i) {
  		case 1:
  			base = OMAP1610_GPTIMER1_BASE;
  			irq = INT_1610_GPTIMER1;
  			break;
  		case 2:
  			base = OMAP1610_GPTIMER2_BASE;
  			irq = INT_1610_GPTIMER2;
  			break;
  		case 3:
  			base = OMAP1610_GPTIMER3_BASE;
  			irq = INT_1610_GPTIMER3;
  			break;
  		case 4:
  			base = OMAP1610_GPTIMER4_BASE;
  			irq = INT_1610_GPTIMER4;
  			break;
  		case 5:
  			base = OMAP1610_GPTIMER5_BASE;
  			irq = INT_1610_GPTIMER5;
  			break;
  		case 6:
  			base = OMAP1610_GPTIMER6_BASE;
  			irq = INT_1610_GPTIMER6;
  			break;
  		case 7:
  			base = OMAP1610_GPTIMER7_BASE;
  			irq = INT_1610_GPTIMER7;
  			break;
  		case 8:
  			base = OMAP1610_GPTIMER8_BASE;
  			irq = INT_1610_GPTIMER8;
  			break;
  		default:
  			/*
  			 * not supposed to reach here.
  			 * this is to remove warning.
  			 */
  			return -EINVAL;
  		}
  
  		pdev = platform_device_alloc("omap_timer", i);
  		if (!pdev) {
  			pr_err("%s: Failed to device alloc for dmtimer%d\n",
  				__func__, i);
  			return -ENOMEM;
  		}
  
  		memset(res, 0, 2 * sizeof(struct resource));
  		res[0].start = base;
  		res[0].end = base + 0x46;
  		res[0].flags = IORESOURCE_MEM;
  		res[1].start = irq;
  		res[1].end = irq;
  		res[1].flags = IORESOURCE_IRQ;
  		ret = platform_device_add_resources(pdev, res,
  				ARRAY_SIZE(res));
  		if (ret) {
  			dev_err(&pdev->dev, "%s: Failed to add resources.\n",
  				__func__);
  			goto err_free_pdev;
  		}
  
  		pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
  		if (!pdata) {
  			dev_err(&pdev->dev, "%s: Failed to allocate pdata.\n",
  				__func__);
  			ret = -ENOMEM;
  			goto err_free_pdata;
  		}
  
  		pdata->set_timer_src = omap1_dm_timer_set_src;
  		pdata->timer_capability = OMAP_TIMER_ALWON |
  				OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;
  
  		ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
  		if (ret) {
  			dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
  				__func__);
  			goto err_free_pdata;
  		}
  
  		ret = platform_device_add(pdev);
  		if (ret) {
  			dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
  				__func__);
  			goto err_free_pdata;
  		}
  
  		dev_dbg(&pdev->dev, " Registered.\n");
  	}
  
  	return 0;
  
  err_free_pdata:
  	kfree(pdata);
  
  err_free_pdev:
  	platform_device_unregister(pdev);
  
  	return ret;
  }
  arch_initcall(omap1_dm_timer_init);
  